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follow-up assessment, 31 participants did not meet criteria for PTSD
and 14 did meet criteria for PTSD. A planned comparison that con-
trolled for treatment condition indicated that there was no difference in
SHCS scores for participants with PTSD,
M
¼
3.07,
SD
¼
1.50, and
without PTSD,
M
¼
3.23,
SD
¼
1.54,
t
(42)
¼
0.10,
p
¼
.74.
Stability of Hypnotizability Scores
In terms of stability of SHCS scores across time, the Pearson correla-
tion coefficient between the two assessments was .47,
p
<
.001.
Specifically, 38% of participants displayed decreased SHCS scores at
the 6-month assessment, 35% displayed the same SHCS score, and 27%
displayed increased SHCS scores.
To index associations between changes in SHCS scores and psycho-
pathology scores, we calculated an SHCS change score by subtracting
the SHCS score at the follow-up assessment from the SHCS score at the
initial assessment. Table 1 presents the Pearson correlation coefficients
between the IES-Intrusion, IES-Avoidance, BAI scores at the initial
assessment and follow-up, the total SHCS scores at the initial and
follow-up assessments, and the SHCS change scores. These correlations
partialed out the effects of treatment condition. To correct for the
multiple correlations being conducted, a Bonferroni adjustment was
made, and an alpha rate of .005 was adopted. The only significant
correlation was between SHCS change scores and IES-Avoidance at the
follow-up assessment. That is, higher IES-Avoidance scores at follow-
up were associated with increased SHCS scores at follow-up compared
to the initial SHCS score.
D
ISCUSSION
Whereas there was general stability of SHCS scores across assess-
ment points (
r
¼
.47), approximately two thirds of participants dis-
played some variation in SHCS scores across assessments. The only
Table 1
Pearson Correlation Coefficients Controlling for Treatment Condition
Initial SHCS Follow-Up SHCS SHCS Change
Initial IES-Intrusions
.04
.30
.26
Initial IES-Avoidance
.01
.19
.18
Initial BAI
.19
.10
.27
Follow-Up IES-Intrusions
.03
.17
.21
Follow-Up IES-Avoidance
.05
.36
.41
Follow-Up BAI
.03
.16
.19
p
<
.01.
PTSD AND HYPNOTIZABILITY
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